JPS61214258A - Write and reproducing integrated magnetic head - Google Patents
Write and reproducing integrated magnetic headInfo
- Publication number
- JPS61214258A JPS61214258A JP5443285A JP5443285A JPS61214258A JP S61214258 A JPS61214258 A JP S61214258A JP 5443285 A JP5443285 A JP 5443285A JP 5443285 A JP5443285 A JP 5443285A JP S61214258 A JPS61214258 A JP S61214258A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- head
- writing
- coil
- reproducing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10541—Heads for reproducing
- G11B11/10543—Heads for reproducing using optical beam of radiation
- G11B11/10547—Heads for reproducing using optical beam of radiation interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、磁気的に書込み、光学的に再生する磁気記録
用磁気ヘッドに係り、特に、書込みと再生を一つのヘッ
ドで行うに好適なリング型磁気ヘッドに関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic recording head for magnetically writing and optically reproducing, and in particular to a ring suitable for performing writing and reproducing with one head. This invention relates to a type magnetic head.
従来のリング型磁気ヘッドにおいては、磁路に巻いたコ
イルを用いて、電磁誘導原理により、磁気的書込みと磁
気的再生を行っていた。しかしながら、線方向、トラッ
ク方向両者の記録密度が増すにつれ、媒体に記録された
単位情報当りの磁区の面積が小さくなり、それに応じて
媒体からの信号磁界も小さくなって、上記電磁誘導原理
にもとづく再生が固層となってきている。特に、トラッ
ク密度を増した場合、信号対雑音比Ｓ／Ｎはトラック幅
Ｗが小さくなるほど急激に小さくなる。現在の磁気ヘッ
ドでは、Ｓ／Ｎを３０ｄＢ以上とした場合、トラック幅
Ｗで１０μｍが限界であり。In a conventional ring-type magnetic head, magnetic writing and magnetic reproduction are performed using a coil wound in a magnetic path based on the principle of electromagnetic induction. However, as the recording density in both the linear direction and the track direction increases, the area of the magnetic domain per unit information recorded on the medium becomes smaller, and the signal magnetic field from the medium also becomes smaller accordingly. Regeneration is becoming a solid phase. In particular, when the track density is increased, the signal-to-noise ratio S/N decreases rapidly as the track width W decreases. In current magnetic heads, when the S/N is set to 30 dB or more, the track width W is limited to 10 μm.
Ｗを１〜５μｍ程度とすることは極めて困難である。一
方、電磁誘導原理を用いず、光を用いて媒体の磁気信号
の再生を行うものとしては、電子通信学会論文誌Ｊ６７
−Ｃ巻１１号８７１頁（１９８４年）に記載されている
例がある。この例では、媒体からの磁気信号を、媒体直
上に平行に置いた磁性ガーネットの磁区模様として磁気
転写と、ファラデー効果により光再生している。この場
合、光ビーム径と同程度のＷ＝２〜５μｍの狭トラック
化が可能であると考えられる。しかしながらこの光再生
ヘッドでは、従来のような磁気的書込みは構成上無理で
あり、再生専用のヘッドとせざるを得ない。磁気記録の
システム構成上、書込みと再生を異なるヘッドで行うこ
とは、アクセスやオーバライドの点で極めて不利であり
、上記記載例ではこの点が配慮されていなかった。It is extremely difficult to set W to about 1 to 5 μm. On the other hand, as a method for reproducing magnetic signals from a medium using light without using the principle of electromagnetic induction,
There is an example described in Vol. C, No. 11, p. 871 (1984). In this example, the magnetic signal from the medium is optically reproduced by magnetic transfer as a magnetic domain pattern of magnetic garnet placed in parallel directly above the medium and by the Faraday effect. In this case, it is considered possible to narrow the track to W=2 to 5 μm, which is about the same as the optical beam diameter. However, with this optical reproducing head, conventional magnetic writing is impossible due to its structure, and a reproducing-only head must be used. Due to the configuration of a magnetic recording system, using different heads for writing and reproducing is extremely disadvantageous in terms of access and overriding, and this point was not taken into account in the above description example.
本発明の目的は、高密度の磁気記録を達成するため、リ
ング型磁気ヘッドにおいて、磁気的書込みと光学的再生
とを同一のヘッドで可能ならしめる書込み・再生一体化
リング型磁気ヘッドを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an integrated write/read ring magnetic head that enables magnetic writing and optical playback using the same head in order to achieve high-density magnetic recording. There is a particular thing.
上記目的を達成するため、本発明ではリング型磁気ヘッ
ドの磁路の一部に巻いたコイルを用い、電磁誘導原理に
よって磁気的書込みを行うとともに、再生としては磁路
の一部あるいは磁路に接して、磁気光学効果を有する磁
性体を配し、これに光を照射することにより、ファラデ
ー効果あるいはカー効果を通じて磁化状態を弁別し、磁
気信号の光学的再生を行う。In order to achieve the above object, the present invention uses a coil wound around a part of the magnetic path of a ring-shaped magnetic head to perform magnetic writing based on the principle of electromagnetic induction. A magnetic material having a magneto-optic effect is placed in contact with the magnet, and by irradiating it with light, the magnetization state is discriminated through the Faraday effect or Kerr effect, and the magnetic signal is optically reproduced.
以下、本発明の実施例により、詳細に説明する。 Hereinafter, the present invention will be explained in detail using examples.
（実施例１）
第１図に示すように、ギャップ長０．５ μｍ、ヘッド
幅３μｍのリング型磁気ヘッド１の磁路の１部にコイル
２を巻きつけ、書込み用コイルとする。また磁路の１部
（図に示すような３）を。(Example 1) As shown in FIG. 1, a coil 2 is wound around a part of the magnetic path of a ring-shaped magnetic head 1 having a gap length of 0.5 μm and a head width of 3 μm to form a writing coil. Also part of the magnetic path (3 as shown in the figure).
Ｆ ａ Ｂ ｅ Ｙ、Ｆｅ、０１２． Ｃｏ Ｚ ｒ等
の磁気光学効果の大きい軟磁性体３として配する。磁性
媒体７への情報の書込みは、コイル２により、電流を印
加し。F a B e Y, Fe, 012. A soft magnetic material 3 having a large magneto-optical effect such as CoZr is used. To write information to the magnetic medium 7, a current is applied by the coil 2.
通常の書込み原理により、ギャップ先端部を強く磁化す
ることにより行う。再生は、磁性体３に直径５μｍの直
線偏光した光５を照射し、磁路中の磁化の向き６（図で
は左）により１反射光の偏光角の回転が符号を反転させ
ることを利用して検知する０本実施例によれば、トラッ
ク幅を光のビーム径（１〜５μｍ）程度に狭めて小さく
することができるとともに、書込み・再生一体型のヘッ
ドとすることができる。This is done by strongly magnetizing the tip of the gap according to the usual writing principle. Reproduction is performed by irradiating the magnetic material 3 with linearly polarized light 5 with a diameter of 5 μm, and utilizing the fact that the rotation of the polarization angle of the reflected light 1 reverses the sign depending on the direction of magnetization 6 (left in the figure) in the magnetic path. According to this embodiment, the track width can be narrowed to about the beam diameter of light (1 to 5 μm), and the head can be integrated into a writing/reproducing head.
（実施例２）
第２図に示すように、媒体７からの信号磁界によって強
く磁化されるヘッドギャップ先端部を、磁気光学効果の
大きい磁性体（ＹｉＦｅｇＯｔｚなと）とし、実施例１
と同様に、光ビームを照射して、磁気光学的に信号再生
を行う。本実施例では、磁化状態の良好なヘッドギャッ
プ先端部で再生を行うので、信号対雑音比を大きくとれ
る利点がある。(Example 2) As shown in FIG. 2, the tip of the head gap, which is strongly magnetized by the signal magnetic field from the medium 7, is made of a magnetic material (such as YiFegOtz) with a large magneto-optic effect.
Similarly, a light beam is irradiated to reproduce signals magneto-optically. In this embodiment, since reproduction is performed at the tip of the head gap where the magnetization state is good, there is an advantage that the signal-to-noise ratio can be increased.
（実施例３）
第３図に示すように、磁路の一部に、切断部分１３を設
け、さらにその上部に、磁性ガーネットあるいはＧ ｄ
Ｃｏなどの希土類、遷移金属合金等、垂直磁化軟磁性
体１１を配する。ガーネットの場合には反射膜１２等も
図のように配する。切断部分から漏洩した信号磁界は、
垂直磁化膜の磁区構造を変化させる。この磁区構造変化
をファラデー効果あるいはカー効果等を用いて磁気光学
的に検知し、信号再生を行う。本実施例の場合、磁気光
学効果の中でも特、に、偏光角回転効果の大きい極力−
効果、ファラデー効果を用いることができるので、信号
対雑音比を大きくとれる利点がある。(Example 3) As shown in FIG. 3, a cut portion 13 is provided in a part of the magnetic path, and a magnetic garnet or G d
A perpendicularly magnetized soft magnetic material 11 made of rare earth such as Co, transition metal alloy, etc. is arranged. In the case of garnet, reflective films 12 and the like are also arranged as shown in the figure. The signal magnetic field leaked from the cut part is
Change the magnetic domain structure of the perpendicularly magnetized film. This change in magnetic domain structure is detected magneto-optically using the Faraday effect or Kerr effect, and signal reproduction is performed. In the case of this example, among the magneto-optical effects, the polarization angle rotation effect is particularly large.
Since the Faraday effect can be used, there is an advantage that the signal-to-noise ratio can be increased.
本発明によれば、トラック幅を光のビーム径（１〜５μ
ｍ）程度にまで極めて小さくすることができるので、磁
気記録の面密度を現在より１桁以上大きくすることがで
きると同時に、書込みと再生を同一のヘッドで行うこと
ができるので。According to the present invention, the track width is set to the light beam diameter (1 to 5 μm).
Since it is possible to make the recording density extremely small to about 1.5 m), the areal density of magnetic recording can be increased by more than an order of magnitude compared to the current density, and at the same time, writing and reproducing can be performed using the same head.
１０ Ｍ Ｈｚ程度の高速アクセス、高速重ね書きが可
能となる。High-speed access of about 10 MHz and high-speed overwriting are possible.
第１図は実施例１の磁気書込み・光再生リングヘッドの
構成図、第２図は実施例２のヘッド構成図、第３図は実
施例３のヘッド構成図である。
１・・・リングヘッド、２・・・書込み用コイル、３・
・・磁気光学効果磁性体、４・・・ヘッドギャップ、５
・・・直線偏光光ビーム、６・・・磁化、７・・・磁性
媒体、８・・・基板、９・・・磁区、１０・・・収束用
レンズ、１１・・・垂直磁化軟磁性体、１２・・・反射
膜、１３・・・切断部、１４・・・再生光。FIG. 1 is a block diagram of a magnetic writing/optical reproducing ring head according to a first embodiment, FIG. 2 is a block diagram of a head according to a second embodiment, and FIG. 3 is a block diagram of a head according to a third embodiment. 1...Ring head, 2...Writing coil, 3.
... Magneto-optic effect magnetic material, 4... Head gap, 5
...Linearly polarized light beam, 6...Magnetization, 7...Magnetic medium, 8...Substrate, 9...Magnetic domain, 10...Converging lens, 11...Perpendicularly magnetized soft magnetic material , 12...Reflection film, 13...Cutting part, 14...Reproduction light.
Claims (1)
を配するとともに、磁路中の一部あるいは磁路に接した
部分に、磁気光学効果を有する磁性体を配し、上記コイ
ルに電流を印加することにより情報の磁気的書込みを行
うとともに、上記磁性体に光を照射し、ファラデー効果
あるいはカー効果により、当該磁性体の磁化状態を弁別
し、再生を行う磁気書込み・光再生複合方式の書込み再
生一体化磁気ヘッド。1. In a ring-type magnetic head, a coil is arranged in a part of the magnetic path, and a magnetic material having a magneto-optical effect is arranged in a part of the magnetic path or in a part in contact with the magnetic path, and a current is applied to the coil. A combined magnetic writing/optical reproducing method that performs magnetic writing of information by applying , irradiates the magnetic material with light, discriminates the magnetization state of the magnetic material by Faraday effect or Kerr effect, and reproduces the information. Write/playback integrated magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5443285A JPS61214258A (en) | 1985-03-20 | 1985-03-20 | Write and reproducing integrated magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5443285A JPS61214258A (en) | 1985-03-20 | 1985-03-20 | Write and reproducing integrated magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61214258A true JPS61214258A (en) | 1986-09-24 |
Family
ID=12970552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5443285A Pending JPS61214258A (en) | 1985-03-20 | 1985-03-20 | Write and reproducing integrated magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61214258A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01165584A (en) * | 1987-12-23 | 1989-06-29 | Fujimoto Seiyaku Kk | Novel 1,8-naphtylidine derivative |
| EP0461907A2 (en) * | 1990-06-13 | 1991-12-18 | Sharp Kabushiki Kaisha | Magneto-optical recording/reproducing device |
| US5237548A (en) * | 1988-06-01 | 1993-08-17 | Hoechst Aktiengesellschaft | Magneto-optic recording structure and method |
| US5353268A (en) * | 1990-08-10 | 1994-10-04 | Minnesota Mining And Manufacturing Company | Thermomagnetic recording system employing a medium having high storage density and direct-overwrite capability as a result of along-track isocoercivity |
| EP1139341A1 (en) * | 1998-12-07 | 2001-10-04 | Fujitsu Limited | Information reproducing device, information reproducing head having the chip, information reproducing device and information reproducing method |
-
1985
- 1985-03-20 JP JP5443285A patent/JPS61214258A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01165584A (en) * | 1987-12-23 | 1989-06-29 | Fujimoto Seiyaku Kk | Novel 1,8-naphtylidine derivative |
| JP2631854B2 (en) * | 1987-12-23 | 1997-07-16 | 藤本製薬株式会社 | Novel 1,8-naphthyridine derivative |
| US5237548A (en) * | 1988-06-01 | 1993-08-17 | Hoechst Aktiengesellschaft | Magneto-optic recording structure and method |
| EP0461907A2 (en) * | 1990-06-13 | 1991-12-18 | Sharp Kabushiki Kaisha | Magneto-optical recording/reproducing device |
| US5202862A (en) * | 1990-06-13 | 1993-04-13 | Sharp Kabushiki Kaisha | Magneto-optical recording and reproducing device having integrally formed recording and reproducing magnetic heads |
| US5325344A (en) * | 1990-06-13 | 1994-06-28 | Sharp Kabushiki Kaisha | Magneto-optical recording and reproducing device having integrally formed recording and reproducing magnetic heads |
| EP0827143A2 (en) * | 1990-06-13 | 1998-03-04 | Sharp Kabushiki Kaisha | Magneto-optical recording/reproducing device |
| EP0827143A3 (en) * | 1990-06-13 | 2000-01-19 | Sharp Kabushiki Kaisha | Magneto-optical recording/reproducing device |
| US5353268A (en) * | 1990-08-10 | 1994-10-04 | Minnesota Mining And Manufacturing Company | Thermomagnetic recording system employing a medium having high storage density and direct-overwrite capability as a result of along-track isocoercivity |
| EP1139341A1 (en) * | 1998-12-07 | 2001-10-04 | Fujitsu Limited | Information reproducing device, information reproducing head having the chip, information reproducing device and information reproducing method |
| EP1139341A4 (en) * | 1998-12-07 | 2005-11-16 | Fujitsu Ltd | Information reproducing device, information reproducing head having the chip, information reproducing device and information reproducing method |
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